Blade edger



I Dec. 9, 1930. F. GRAFFENBERG'E'R 1,784,625

BLADE EDGER Filed Sept. 11, 1929 gwuento'c Z6 Z6 E's-2205202! ERAFFENBEREM Patented Dec. 9, 1930 UNITED STATES PATENT oFFicE FRIEDRICK GRAFFENBERGEB, OF MILWAUKEE, WISCONSIN BLADE EDGER Application filed September 11, 1929. 'Serial No. 391,857.

3 ments, which is of simple design and construction so as to permit its manufacture at an extremely low cost.

Another object is the provision of an edger which will renew the cutting edge of an instrument by realigning the several fibres contained therein to thereby remove the irregular saw-toothed edge that is characteristic of a dull blade, without removing any of the metal by-abrasion. By the use of an edger constructed in accordance with the teachings of the present invention, I have found that a blade may be re-edged many times and still maintain its original keenness.

A further object is to provide an edger which will be self-cleaning during the edging operation to preclude the collection of dirt or foreign matter that would otherwise 1mpair the utility of the device. 7 1

Other objects and advantages will appear from the following description of an illustrative embodiment of the present invention.

In the drawings Figure 1 is a side elevational view of an edger (drawn on a magnified scale) constructed in accordance with the teachings of the present invention.

Fig. 2 is a top plan vieW of the edger.

Fig. 3 is a vertical sectional view taken on the line 33 of Fig. 1. V

The edger shown in the accompanying drawings comprises a pair of rotatable coaxial disks 10 fixedly mounted in facial contact on a hub 11. The disks 10 coact to form the edging means for the blade and function in a manner to be hereinafter more specifically described. A bushing 12 which is slightly longer than the'hub '11 is inserted through a centrally disposed longitudinal aperture 14 in the hub 11 to form a bearing upon which the hub 11 and disks 10 may rotate freely as'a'unit. The bushing 12 is permanently secured between the extremities of a bifurcated handle 15 by means of a bolt 16 which passes freely through an aperture 17in one arm of the handle and an axial bore 18 in the bushing 12. The bolt 16 is then directed through a threaded aperture 19 in the. other arm of the handle 15. The

head of the bolt 16 is then drawn against the arm of the handle to'anchor the bushing tightly between the spaced arms of the handle 15. A look nut 20 is then applied to the threaded end of the bolt to prevent the bolt 16 or bushing 11 from ever becoming accidentally loosened.

The disks 10, which are preferably formed of hardened steel or other suitable material,

are provided with central apertures 21 which pass, freely over a shank portion 22 of the hub 11. Due end of the hub 11 is fashioned in the form of a flange 23 having flattened peripheral portions 24 to receive a wrench. The

shankportion 22 of the hub is screw threaded to receive a nut 25 to anchorthe disks 10 seourely upon the hub 11.

Each disk 10 is provided with a flat outer face and a rounded peripheral edge. The

inner "face of each disk" is preferably of concavo-convex form. The central portion of the disk being concaved while the peripheral portion is convexed. A circular series of apertures 26 are formed in the disks 10. The radius of the series of apertures is virtually equal to the radiusof the concave portion of the disk so that the peripheryof each aperture cuts both theconcave and convex portions of the inner face of the disk. A pair ofholes 27 are drilled in each disk 10. These 7 holes preferably lie between the central aperture 21 and the circular series of apertures 27 in the disks are so positioned that when they register the circular series of apertures 26. It will-be noted at this time that the holes 7 position indicated in Fig. l of the drawings. The edger is then applied so that the blade lies between the two disks and in the gap formed between the divergent convex portions of the disks. By applying a very light pressure upon the handle 15 and running the disks upwardly and downwardly along the blade .it willreadily be seen that the portion of the blade in contact with the convex part of one disk will be bowed slightly into an aperture 26 which liesdirectlyopposite it.

This wiping action of the convex portions or? the disks across adjacent portions of the blade will work the fibres of the edge so acted upon into alignment. By removing the disks from engagement with the blade and turning the disks slightly before reapplying the disks to the blade it will be seen that the convex portions of the disks. will each actupona new portion of the blade to align a new series of fibres of theedge by their arcuate wiping actijon. The same result may also be obtained by turning the blade end for end to permit portions of the edge that were acted upon by the convexsurface ofone diskto now be acted upon by the convex portions of the other disk. I have found that by runningthe edger lightly back and forth over the blade a few times and then reversing the blade and repeating the operation a very keen edge may be restored upon a blade whose edge was very dull.

The staggered relationship of the circular series of holes is of'real importance and this relationship serves a dualpurpose. Firstly, it permits the portion oflthe blade lyingacross an aperture to be slightly bowed under the influence of the convex portion of the other disk toiallow the gentle arcuate Wiping action oft-hat portion of the disk to effectivelywork the fibres ofthe edge'into proper alignment. Secondly, the staggered relationship of the circular series of apertures insures against the accumulation of dirt or other foreignmaterial; between the disks by reasonofthefact thatthe dirt-particles wiped ofi ofthe blade by, either the convex portion of the disk will be discharged through the apertures and not bedirected between the disks. v

Obviously'the process of edging a blade in the manner above described will be greatly facilitated by the application of a small amount of lubricant to the bladeto besharpened. in addition to aiding the edging process the lubricant will prevent corrosion due to water deposits either on the blade or on the edging disks. v

hile the device portrayed in the accompanying drawings is particularly adapted for use in edging razor blades by slight modification of angle of the gap formed by th divergent convex portions of the dlsks the edger can be readilyadapted for knife blades and other keen edged instruments.

It will readily be seen from the foregoing description that an edger has been provided which is extremely simple in form, effective in operation, and one which may be produced at an extremely low cost. Furthermore the present device is capable of realigning the fibres of the edge of a dull blade to reestablish its keenness without abrasive action and as afurther advantage the device is so designed that it automatically cleans itself in the course of reedging the blade.

lVhile the. device has been described in considerable detail in the foregoing speciha.- tion it is understood that various changes may be made in its embodiment without departing from or sacrificing any of the advantages hereinafter claimed.

1 claim i 1. A blade edger comprising a pair of coaxial disks rotatable as a unit andcooperatingto form an inwardly tapered-peripheral gap forreceiving the blade to be edged, each disk having a circular series of recesses adjacent said gap, the recesses in each disk being staggered with respect to those inthe other disk andin overlapping relation therewith.

2. A blade edger comprising apair of coaxial disks rotatableasa unit,'the adjacent faces. of the disks cooperating to form a peripheral gap for receiving a blade to be edged, there being a circular series of apertures in each disk, said apertures lying partially within the gap" between said disks, said apertures in onedisk lyingin overlapping relation with said apertures in said other disk.

3. A blade edger comprisinga pair of-coaxial disks rotatablefas a'unit, the adjacent faces of said disks having convex portions cooperating to form a peripheral gap therebetween, there. being a circular series of recesses in each disk, said ,seriesofrecesses in one disk lying in overlapping relation with said series in said other disk.

l. A blade edger comprising, apair of coaxial disks rotatable as a unit, said disks having abutting faces of. concavo-convex form, there being a circular series of apertures in said disks, said apertures lying partially within said concave portion and partially within said .convex portion of said disks, and said apertures in oneof said disks being staggeredvwith relation to said apertures in said other disk.

A blade edger comprising a pair of coaxial disks rotatableas a unit there being a circular series ofapertures in eachof said disks, means for preventing relative rotation of said disks toposi-tion said aperturesin one disk instaggered relation Withthe apertures in said other disk, and convex portions on saidv disks cooperating to form. a peripheral blade receiving gap. Y e

6. A blade edger'comprising a pair of coaxial disks sa-id disks having. abutting faces of concavo-convex forin,- .said concave portion being centrally disposed on said disks, said convex portions merging With said concave portions and extending to the periphery of said disks, there being a circular series of recesses in each disk, and means for positioning said disks to provide a staggered relationship between the recesses of one disk With respect to the recesses of said other disk.

7 A blade edger comprising a pair of abutting axially aligned disks, there being a circular series of apertures in each of said disks, means for positioning the recesses in one disk in overlapping relation with the recesses in said other disk, a hub for anchoring said disks in abutting relation, a sleeve on Which said hub and dlsks may rotate as a unit, a handle on which sald sleeve 1s mounted, and means for anchoring said sleeve in said handle.

8. A blade edger comprising a pair of abutting coaxial disks rotatable as a unit, peripheral convex portions on said disks, said peripheral portions cooperating to form a blade receiving groove, there being a circular series of apertures in each of said disks, said series of apertures in one of said disks overlapping said series of apertures in said other disk, a trunnion on Which said disks are rotatably mounted, and a handle on which said trunnion is mounted.

In Witness whereof, I hereunto subscribe my name this 9 day of September, 1929.

FRIEDRIOK GRAFFENBERGER. 

